Head-Mounted Display Optical Stack for Compact Focal Length
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Solution Overview
Problem
Head-mounted display devices face challenges in reducing focal length and thickness, which affects their portability and user experience.
Innovation Solution
The design incorporates a substrate with display elements, a first polarizing layer, a reflective layer, a light-separating layer, a lens, and a second polarizing layer, where the light-separating layer and second polarizing layer can be in direct contact with the lens, optimizing the optical path to minimize focal length and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional display device structures are used, then display functionality is achieved, but focal length and thickness cannot be reduced
Solution Approach 1:
The patent combines multiple optical functions (light separation, polarization, and focusing) into a single integrated optical assembly. The light-separating layer, polarizing layers, and lens are merged into one compact structure that performs multiple optical operations simultaneously, thereby reducing the overall focal length and thickness while maintaining display functionality.
Solution Approach 2:
The patent employs a nested structure where the light-separating layer is positioned between the display and the lens, with polarizing layers integrated within the optical path. This nested arrangement allows multiple functional layers to be compactly organized, reducing the overall thickness and focal length of the display device.
2Length of stationary object
If conventional display device structures are used, then display functionality is achieved, but thickness and portability are compromised
Solution Approach 1:
By merging the light-separating layer, polarizing layers, and lens into a single integrated optical assembly, the patent reduces the number of separate components that need to be assembled. This integration simplifies the manufacturing process while achieving reduced thickness and improved portability.
Solution Approach 2:
The patent utilizes thin-film structures for the polarizing layers and light-separating layer, which can be directly contacted with the lens. This thin-film approach enables significant thickness reduction while maintaining the necessary optical functions, making the device more portable and easier to manufacture in compact forms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the focal length and thickness of the head-mounted display device, enhancing its portability and user experience by improving the alignment and polarization of light, allowing for more compact and efficient display technology.
Implementation Method 1
a first polarizing layer disposed on the display; a reflective layer disposed on the first polarizing layer... a second polarizing layer disposed on the lens
Implementation Method 2
a reflective layer disposed on the first polarizing layer
Implementation Method 3
a lens disposed on the light-separating layer
Data Source
AI summary
A head-mounted display device includes a display including a substrate and a plurality of display elements disposed on the substrate, a first polarizing layer disposed on the display, a reflective layer disposed on the first polarizing layer, a light-separating layer disposed on the reflective layer, a lens disposed on the light-separating layer, and a second polarizing layer disposed on the lens.